<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="css/materialdesignicons.min.css">
    <style>
        .nav{
            display: flex;

            align-items: center;
            justify-content:space-between;
        }
        .title{
            display: flex;
            flex: 1;
            border-radius: 5px;
            background-color: rgb(221, 215, 215);
            align-items: center;
            
        }
        .a{
            font-size: 20px;
            margin: 0 10px;
        }
        .b{
            margin: 0 10px;
            font-size: 20px;
            color: #666;
        }
        .c{
            
            color: #666;
        }
    </style>
</head>
<body>
    <div class="nav">
    
        <div class="title">
            <div class="b"><span class="mdi mdi-magnify"></span></div>
            <div class="c">搜索博文/帖子/用户</div>
            
        </div>
        <div class="a">
             <span class="mdi mdi-plus-circle-outline"></span>   
        </div>
    
    </div>

    

</body>
</html>